A fully integrated SiGe:C BiCMOS low noise amplifier (LNA) for Ultra-Wideband (UWB) has been implemented in a 0.4 um SiGe BiCMOS technology from Motorola Semiconductors which features a cut-off frequency of 46 GHz. The LNA exhibits a wide bandwidth, from 3 to 10.5 GHz, with a flat gain of 24 dB. This amplifier shows a noise figure below 4.4 dB over the whole bandwidth and achieves good return losses without any matching network. This 3 -10.5 GHz SiGe LNA design meet FCC PART15 restrictions for UWB technology.Index Terms -SiGe LNA, low noise, Darlington amplifier, UWB.
This paper describes the design, simulation and practical results of a phase modulator based in an hybrid coupler and two varactor diodes in the band from 2.0 GHz to 3.0 GHz for TTC proposes. A minimum modulation index of 1.22 was obtained at the highest frequency to 1.57 at the lowest. This modulator consist of a two stages hybrid coupler with varactor diodes. Simulation is performed using ADS 2016.01. Even both varactor diodes are feed by the same modulation signal, each of them has his own voltage input for correct varactor impairments. In the measures, excellent isolation is achieved for the 1 st and 4 th port of the ring.
A wideband frequency multipliers using SiGe bipolar transistors are proposed in this paper. The main circuit of these frequency multipliers consists of an attenuator followed by a bias network and a band pass filter which selects the desired harmonic at the output. The designed doubler can convert a 2-3 GHz input signal to a 4-6 GHz signal, with high suppressions of 59 dB, and 41 dB on the fundamental, and the third harmonic respectively. The tripler can convert a 2.3-2.7 GHz input signal to a 7-8 GHz signal, with suppressions of 68 dB, 52 dB, and 43 dB on the fundamental, the second, and fourth harmonics respectively.
Resumen-En este trabajo se presentan distintas actividades complementarias realizadas para la mejora del proceso de aprendizaje de conceptos relacionados con la Ingeniería de Telecomunicación. En particular, se describe la realización de simposios dentro de las actividades de la asignatura. En estos simposios se recrea de la manera más realista posible el envío, revisión y presentación de trabajos técnicos en un congreso científico/profesional. Otra de las actividades complementarias que realizan los estudiantes es la elaboración de una enciclopedia en formato "wiki" a la cual contribuyen todos de manera colaborativa. Adicionalmente y para hacer hincapié en la aplicación práctica de los conocimientos que se adquieren en la asignatura, se organizan visitas a empresas de la región. Mediante la realización de estas actividades, los estudiantes trabajan competencias como el trabajo en equipo, el desarrollo del pensamiento crítico y reflexivo, la capacidad de gestión de la información y del tiempo y la capacidad de comunicar conceptos de manera clara y ordenada, adaptando el lenguaje según el tipo de audiencia.
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